    <div class="refentry" id="glDrawBuffers">
      <div class="titlepage"></div>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glDrawBuffers, glNamedFramebufferDrawBuffers — Specifies a list of color buffers to be drawn
    into</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glDrawBuffers</strong>(</code>
              </td>
              <td>GLsizei <var class="pdparam">n</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>const GLenum *<var class="pdparam">bufs</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glNamedFramebufferDrawBuffers</strong>(</code>
              </td>
              <td>GLuint <var class="pdparam">framebuffer</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLsizei <var class="pdparam">n</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>const GLenum *<var class="pdparam">bufs</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>framebuffer</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>Specifies the name of the framebuffer object for
          <code class="function">glNamedFramebufferDrawBuffers</code>.</p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>n</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>Specifies the number of buffers in
          <em class="parameter"><code>bufs</code></em>.</p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>bufs</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>Points to an array of symbolic constants specifying the
          buffers into which fragment colors or data values will be
          written.</p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p><code class="function">glDrawBuffers</code> and <code class="function">glNamedFramebufferDrawBuffers</code> define an array of buffers into
    which outputs from the fragment shader data will be written. If a fragment
    shader writes a value to one or more user defined output variables, then
    the value of each variable will be written into the buffer specified at a
    location within <em class="parameter"><code>bufs</code></em> corresponding to the location
    assigned to that user defined output. The draw buffer used for user
    defined outputs assigned to locations greater than or equal to
    <em class="parameter"><code>n</code></em> is implicitly set to <code class="constant">GL_NONE</code>
    and any data written to such an output is discarded.</p>
        <p>For <code class="function">glDrawBuffers</code>, the framebuffer object that
    is bound to the <code class="constant">GL_DRAW_FRAMEBUFFER</code> binding will be
    used. For <code class="function">glNamedFramebufferDrawBuffers</code>,
    <em class="parameter"><code>framebuffer</code></em> is the name of the framebuffer object.
    If <em class="parameter"><code>framebuffer</code></em> is zero, then the default
    framebuffer is affected.</p>
        <p>The symbolic constants contained in <em class="parameter"><code>bufs</code></em> may
    be any of the following:</p>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <code class="constant">GL_NONE</code>
              </span>
            </dt>
            <dd>
              <p>The fragment shader output value is not written into any color
          buffer.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">GL_FRONT_LEFT</code>
              </span>
            </dt>
            <dd>
              <p>The fragment shader output value is written into the front
          left color buffer.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">GL_FRONT_RIGHT</code>
              </span>
            </dt>
            <dd>
              <p>The fragment shader output value is written into the front
          right color buffer.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">GL_BACK_LEFT</code>
              </span>
            </dt>
            <dd>
              <p>The fragment shader output value is written into the back left
          color buffer.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">GL_BACK_RIGHT</code>
              </span>
            </dt>
            <dd>
              <p>The fragment shader output value is written into the back
          right color buffer.</p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">GL_COLOR_ATTACHMENT</code>
                <span class="emphasis">
                  <em>n</em>
                </span>
              </span>
            </dt>
            <dd>
              <p>The fragment shader output value is written into the
          <span class="emphasis"><em>n</em></span>th color attachment of the current
          framebuffer. <span class="emphasis"><em>n</em></span> may range from zero to the value
          of <code class="constant">GL_MAX_COLOR_ATTACHMENTS</code>.</p>
            </dd>
          </dl>
        </div>
        <p>Except for <code class="constant">GL_NONE</code>, the preceding symbolic
    constants may not appear more than once in <em class="parameter"><code>bufs</code></em>.
    The maximum number of draw buffers supported is implementation dependent
    and can be queried by calling <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with the argument
    <code class="constant">GL_MAX_DRAW_BUFFERS</code>.</p>
      </div>
      <div class="refsect1" id="notes">
        <h2>Notes</h2>
        <p>The symbolic constants <code class="constant">GL_FRONT</code>,
    <code class="constant">GL_BACK</code>, <code class="constant">GL_LEFT</code>,
    <code class="constant">GL_RIGHT</code>, and <code class="constant">GL_FRONT_AND_BACK</code>
    are not allowed in the <em class="parameter"><code>bufs</code></em> array since they may
    refer to multiple buffers.</p>
        <p>If a fragment shader does not write to a user defined output
    variable, the values of the fragment colors following shader execution are
    undefined. For each fragment generated in this situation, a different
    value may be written into each of the buffers specified by
    <em class="parameter"><code>bufs</code></em>.</p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p><code class="constant">GL_INVALID_OPERATION</code> error is generated by
    <code class="function">glNamedFramebufferDrawBuffers</code> if
    <em class="parameter"><code>framebuffer</code></em> is not zero or the name of an existing
    framebuffer object.</p>
        <p><code class="constant">GL_INVALID_ENUM</code> is generated if one of the
    values in <em class="parameter"><code>bufs</code></em> is not an accepted value.</p>
        <p><code class="constant">GL_INVALID_ENUM</code> is generated if the API call
    refers to the default framebuffer and one or more of the values in
    <em class="parameter"><code>bufs</code></em> is one of the
    <code class="constant">GL_COLOR_ATTACHMENT</code><span class="emphasis"><em>n</em></span>
    tokens.</p>
        <p><code class="constant">GL_INVALID_ENUM</code> is generated if the API call
    refers to a framebuffer object and one or more of the values in
    <em class="parameter"><code>bufs</code></em> is anything other than
    <code class="constant">GL_NONE</code> or one of the
    <code class="constant">GL_COLOR_ATTACHMENT</code><span class="emphasis"><em>n</em></span>
    tokens.</p>
        <p><code class="constant">GL_INVALID_ENUM</code> is generated if
    <em class="parameter"><code>n</code></em> is less than 0.</p>
        <p><code class="constant">GL_INVALID_OPERATION</code> is generated if a symbolic
    constant other than <code class="constant">GL_NONE</code> appears more than once in
    <em class="parameter"><code>bufs</code></em>.</p>
        <p><code class="constant">GL_INVALID_OPERATION</code> is generated if any of the
    entries in <em class="parameter"><code>bufs</code></em> (other than
    <code class="constant">GL_NONE</code> ) indicates a color buffer that does not
    exist in the current GL context.</p>
        <p><code class="constant">GL_INVALID_OPERATION</code> is generated if any value
    in <em class="parameter"><code>bufs</code></em> is <code class="constant">GL_BACK</code>, and
    <em class="parameter"><code>n</code></em> is not one.</p>
        <p><code class="constant">GL_INVALID_VALUE</code> is generated if
    <em class="parameter"><code>n</code></em> is greater than
    <code class="constant">GL_MAX_DRAW_BUFFERS</code>.</p>
      </div>
      <div class="refsect1" id="associatedgets">
        <h2>Associated Gets</h2>
        <p><a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument
    <code class="constant">GL_MAX_DRAW_BUFFERS</code></p>
        <p><a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument
    <code class="constant">GL_DRAW_BUFFER</code><span class="emphasis"><em>i</em></span> where
    <span class="emphasis"><em><code class="code">i</code></em></span> indicates the number of the draw
    buffer whose value is to be queried</p>
      </div>
      {$pipelinestall}{$examples}
      <div class="refsect1" id="versions">
        <h2>Version Support</h2>
        <div class="informaltable">
          <table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
            <colgroup>
              <col style="text-align: left; "/>
              <col style="text-align: center; " class="firstvers"/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; " class="lastvers"/>
            </colgroup>
            <thead>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; ">

            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
                <span class="bold"><strong>OpenGL Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function / Feature Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.2</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.3</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.2</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.3</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.4</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.5</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                  <code class="function">glDrawBuffers</code>
                </td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">✔</td>
                <td style="text-align: center; border-bottom: 2px solid ; ">✔</td>
              </tr>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">
                  <code class="function">glNamedFramebufferDrawBuffers</code>
                </td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p> <a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>,
    <a class="citerefentry" href="glColorMask"><span class="citerefentry"><span class="refentrytitle">glColorMask</span></span></a>,
    <a class="citerefentry" href="glDrawBuffers"><span class="citerefentry"><span class="refentrytitle">glDrawBuffers</span></span></a>,
    <a class="citerefentry" href="glLogicOp"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>,
    <a class="citerefentry" href="glReadBuffer"><span class="citerefentry"><span class="refentrytitle">glReadBuffer</span></span></a></p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright © 2003-2005 3Dlabs Inc. Ltd.
            Copyright © 2010-2014 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.
        </p>
      </div>
    </div>
